What type of doors is used for routine passage to superstructure from weather decks?

The choice of Quick Acting Water Tight Doors (QAWTD) for routine passage from weather decks to the superstructure is primarily due to their design and functionality in marine environments. These doors are specifically engineered to seal quickly and effectively, providing essential water-tightness to prevent flooding in the vessel. In situations where there is a risk of water intrusion from weather decks due to waves or heavy rains, having a door that can seal off areas rapidly is crucial for the safety of the ship and its crew.

In addition to their strong sealing ability, QAWTDs generally are designed to withstand the demanding conditions found on a vessel, such as the impact of high winds and water pressure. This makes them particularly suited for areas that will frequently experience the elements, maintaining the integrity of the superstructure.

The other door types mentioned serve different purposes; fireproof doors are primarily focused on preventing the spread of fire, heavy-duty sliding doors are typically used for efficient access in cargo areas, and regular entry doors may not provide the water-tightness required in these specific marine applications. Therefore, when considering the safety and functionality needed for transitioning between the superstructure and weather decks, QAWTDs are the appropriate choice.